Cheap flights from Washington to Islip

One-way fares from $526 · WAS → ISP · prices found by travellers in the last 48 hours

Compare all dates Islip → Washington
Cheapest fare
$526

Frontier Airlines · Sat, Nov 14

Cheapest month
November

from $526

Direct flights
Not recently

Usually 1+ stop

Quickest trip
5h 04m

400 km

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Cheapest month to fly from Washington to Islip

Lowest one-way fare per person in each month. Choose a month to see every date.

  1. November 2026 Cheapest $526

Cheapest dates in November 2026

The lowest fares we've seen for each day, cheapest first.

Frontier Airlines
Depart21:52 Sat, Nov 14BWI → ISP 5h 04m · 1 stop
$526one way, per person
View deal
See every date in November 2026 →

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Getting around

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About flights from Washington to Islip

Washington (WAS) and Islip (ISP) are about 400 km apart. We haven't seen direct fares on this route recently, so expect at least one stop; the quickest journey we've seen takes about 5h 04m. Over the next few months, one-way fares start from $526, and November 2026 is currently the cheapest month to fly.

These prices come from searches travellers made in the last 48 hours, so they move quickly. If you see a good fare, it's worth booking soon. FlightsExp is free to use: you book directly with our travel partner.

Frequently asked questions

How much is a flight from Washington to Islip?

The cheapest one-way fare we've seen recently is $526 with Frontier Airlines, departing Saturday, November 14, 2026.

What is the cheapest month to fly from Washington to Islip?

November 2026 currently has the lowest fares, from $526 one way.

Are there direct flights from Washington to Islip?

We haven't seen direct fares recently, so most journeys include at least one stop.

How long is the flight from Washington to Islip?

The quickest journey we've seen takes about 5h 04m. Washington and Islip are around 400 km apart.

Which airlines fly from Washington to Islip?

Recent fares on this route were with Frontier Airlines.

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